Material: Aluminum alloy (surface oxidation),Tungsten steel(blade)30,60,45design fits most of cutting plotter. High quality and extra Long life.Super wear Resistance,high hardness, Application:fit for and most domestic and imported plotter Carbide tip with higher hardness (HRA93),higher hardness,greater strength, tip more sharper,cutting plotter lettering faster Note:Lighting,display and other factors may cause COLOR SHADING Colour:Photo Color Material:steel Size:Full length: 23.5mm diameter: 2mm Package Contents: 20 x 45 degree red knives 20 x 60 degree blue knives 4 x tool holder Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.